Device for adjustment of the longitudinal position of an alpine binding

Device for longitudinal adjustment of an alpine ski binding, designed to hold a boot supported on a ski, said binding comprising a position-retention device (3) for holding an end of a boot, a body (4), and a base (5) supporting said body by which said binding may be assembled to said ski, said adjustment device further comprising a longitudinal slide-rail (8) attached to said ski and along which said binding can slide, and means for blocking said binding on said slide-rail in at least two different longitudinal positions, said device comprising a base plate (9) with an upper surface for supporting said base (5) of said binding, said base plate (9) being mounted so as to slide on said slide-rail (8) and incorporating a longitudinally-positioned locking mechanism (35), spring means (40) being housed in said base (5) for elastically returning said locking mechanism (35) to locking position, and a transversely movable control button (10) operatively connected to said locking mechanism (35) for controlling opening of said locking mechanism, wherein said slide-rail (8) comprises a central portion having longitudinally aligned teeth (23-31) delimiting between said teeth at least two tooth spaces, and wherein locking mechanism (35) having a free end equipped with a control button (10) accessible on a lateral edge of said base plate, said locking mechanism incorporating three juxtaposed teeth (45, 46, 47) distributed in a longitudinal direction, including two longitudinally aligned end teeth (45, 47) and a central tooth (46) set back transversely, said end teeth engaging in two successive tooth spaces of said slide-rail under the elastic force of a blocking mechanism return spring (40), said central tooth (46) coming into abutment against a tooth of said slide-rail adjacent to said two tooth spaces, cooperating with said tooth spaces on said slide-rail by transverse engagement, so as to immobilize said base plate (9) longitudinally.